[AT] 16 HP Onan twin

[Andy Glines]

My Gravely 816 tractor has an Onan 2 cylinder engine (B43M-GA 016).  One of the exhaust valve seats is loose in the block causing that cylinder to have no compression.  It may be easier to use a different engine than to fix this one.  There are other engines available in the local ads.  Or course they are different model numbers even though they look the same as mine.  Is there a good resource for me to determine the difference between them?
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